1. Floyd Mayweather Jr.

Earnings: $300M

Athlete, Boxing

Mayweather's $300 million year shatters the record for athlete earnings, which was previously held by Tiger Woods who banked $115 million in 2008. Mayweather's May 2 fight against Manny Pacquiao crushed multiple boxing financial records, including PPV buys (4.4 million), total gate ($73 million) and sponsorships ($13 million). The fight is expected to gross more than $600 million once everything is counted.Mayweather has typically shunned endorsement deals, but inked agreements with Hublot, FanDuel and Burger King ahead of the May fight. The Pacquiao fight marked the fifth bout in the blockbuster 30-month, six fight deal he signed with Showtime in 2013. Mayweather, whose record stands at 48-0, plans to fight in September to complete his Showtime deal and then retire.